FU-P12-T2-1: Fix stacking click event listeners in updateLatencyTable

[SoundBlaster]

Description

Fixes a listener-stacking bug in the Web UI dashboard: updateLatencyTable was called on every polling cycle (~2 s) and each call added a new click listener to the same <tbody> element. After N refreshes, a single button click triggered N fetches to /api/analytics/param-patterns. The delegated click handler is now registered once in setupEventHandlers (attached to el("latency-table")) and removed from updateLatencyTable.

Changed file: src/mcpbridge_wrapper/webui/static/dashboard.js

Type of Change

• Bug fix

Quality Gates

• make test - All tests pass with ≥90% coverage (465 passed, 95.6% coverage)
• make lint - No linting errors (ruff check src/ — all checks passed)
• make format - Code is properly formatted
• make typecheck - Type checking passes
• make doccheck - Documentation is synced with DocC (if docs changed)

Documentation Sync

• Documentation changes are synced with DocC catalog (or N/A) — no docs changed

Testing

• Added/updated tests for new functionality — no JS test suite; Python tests unaffected
• All tests pass locally
• Manually tested the changes

Checklist

• Code follows the project's style guidelines
• Self-review completed
• Comments added for complex code
• Documentation updated (if needed)
• No new warnings generated
• PR title is descriptive